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File:watervapor cup.jpg|thumb|right|Water condenses into visible droplets (aerosol) after evaporating from a cup of hot tea In physics a '''vapor''' (American English spelling) or '''vapour''' (British) is a substance in the gas phase at a temperature lower than its critical temperature|critical point,R. H. Petrucci, W. S. Harwood, and F. G. Herring, ''General Chemistry'', Prentice-Hall, 8th ed. 2002, p. 483–86. which means that the vapor can be condensation|condensed to a liquid by increasing its pressure without reducing the temperature. Vapor is a different substance than aerosol. Aerosol is a suspension of tiny particles of liquid, solid or both within a gas. For example, water has a critical temperature of 374 °C (647 K), which is the highest temperature at which liquid water can exist. In the Earth's atmosphere|atmosphere...
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